What a cool science project. Blow into the straws and watch the lungs inflate!
Experimente für Kinder: 35 wahnsinnig coole DIY Ideen für Zuhause!
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The Water Cycle activity
This is a wonderful way to teach geography, and all you need are boxes and paint! You could keep these in the classroom and have the students throughout the year place interesting facts they discover about each location inside the boxes.